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Unformatted text preview: TC Neuhs 11/5/07 Physics 11 E. Sabancilar Lab #4: Ballistic Pendulum Introduction and Theory: The purpose of this lab was to investigate inelastic collisions. We looked at two different situations, one in which a bullet is fired by a gun into a block where it becomes imbedded, this would be a perfectly inelastic collision, and determining the initial velocity of the bullet. In the second we are using projectile motion to determine the muzzle velocity of the bullet, or the velocity at which the bullet leaves the gun. In part one since we know the mass of the bullet and the block we can determine the initial velocity by the conservation of momentum equation P i = P f mv o = (m+M)v f Where m is the mass of the bullet and M is the mass of the block. This equation is valid; however, there are two unknowns, v o and v f . Therefore, we must introduce a new equation; we can use the work energy formula W = KE+ PE W = + + + 12m Mv2 m Mgh V= 2gh Then by substituting the two equations we can see that V o = + m Mm 2gh This final equation would give us the velocity of the bullet just before it hits the block. In part two we want to find the velocity of the bullet just as it leaves the gun. We can find this by looking at the projectile motion of the bullet. H = 12gt2 T = 2hg Where t time, h is the vertical height and g is the acceleration due to gravity. We can then substitute this into the horizontal equation R = v o t substitute V o = R2hg Where r is the horizontal distance traveled. By using this equation the muzzle velocity can be attained. Data and Performance: See attached data sheet for raw data....
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- Spring '08